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Theorem lbioog 10147
Description: An open interval does not contain its left endpoint. (Contributed by Jim Kingdon, 30-Mar-2020.)
Assertion
Ref Expression
lbioog  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  -.  A  e.  ( A (,) B ) )

Proof of Theorem lbioog
StepHypRef Expression
1 xrltnr 10013 . . . 4  |-  ( A  e.  RR*  ->  -.  A  <  A )
2 simp2 1024 . . . 4  |-  ( ( A  e.  RR*  /\  A  <  A  /\  A  < 
B )  ->  A  <  A )
31, 2nsyl 633 . . 3  |-  ( A  e.  RR*  ->  -.  ( A  e.  RR*  /\  A  <  A  /\  A  < 
B ) )
43adantr 276 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  -.  ( A  e.  RR*  /\  A  <  A  /\  A  < 
B ) )
5 elioo1 10145 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  e.  ( A (,) B )  <->  ( A  e.  RR*  /\  A  < 
A  /\  A  <  B ) ) )
64, 5mtbird 679 1  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  -.  A  e.  ( A (,) B ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    /\ w3a 1004    e. wcel 2202   class class class wbr 4088  (class class class)co 6017   RR*cxr 8212    < clt 8213   (,)cioo 10122
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-pre-ltirr 8143
This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-iota 5286  df-fun 5328  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-pnf 8215  df-mnf 8216  df-xr 8217  df-ltxr 8218  df-ioo 10126
This theorem is referenced by: (None)
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